Yokogawa Extractive Oxygen Gas Analyzer TDLS220 - Manual (Page 58)

<7 ROUTINE MAINTENANCE> 7-5
IM 11Y01B02-01E-A 4th Edition September 11, 2012-00
• Using optical grade glass cleaner or IPA, wet the surface of a non-abrasive lint-free tissue. Place
the wetted tissue on the surface of the mirror and drag across the mirror face in one direction only.
Use a second clean, dry tissue and wipe in one direction only to dry the surface. Inspect for
cleanliness and if necessary, repeat the process.
- NOTE: If suitable cleaning media are not available then contact Yokogawa service
group and a cleaning kit can be purchased.
• If the mirror cannot be cleaned such that there are no traces of any films, dirt, etc. then it should be
replaced with a new mirror – contact Yokogawa for replacement parts.
• Once the mirror is ready for re-installation and the o-ring has been inspected/replaced, then the
mirror within its mounting plate can be re-installed.
- Carefully check the mirror surface again from different angles to ensure it is
thoroughly clean before re-installation!
• The rotational position of the mirror within the mounting plate is not specific.
• The rotational position of the mounting plate onto the end of the flow cell is also not specific.
• Carefully install the mirror and mounting plate onto the cell and rotate such that the holes align with
the threads, hand tighten the fasteners with lock washers in position.
• Using the 7/64” Allen key wrench, carefully hand tighten each screw using a diagonal pattern and
gradually increase each screw incrementally – do not fully tighten one screw at a time, tighten them
down evenly and incrementally to a maximum of 18 lb/in torque.
• When the mirror is fully fastened, turn on the analyzer and check the transmission level to see if
normal levels have been restored and if the measurements now appear normal. Be careful not to
touch hot surface of the gas cell. If so the transmission level is restored, replace the
insulation end cap and al
low 30 minutes for temperature stabilization.
• Check the Zero and Span with appropriate gases.
• If there is no change in transmission and/or the results are still noisy/unexpected then
proceed with removal and cleaning of the window.